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Method and apparatus for manufacturing a battery safety valve, a battery safety valve, and method for manufacturing a battery case lid

a battery safety valve and manufacturing method technology, applied in the manufacture of cell components, final product manufacturing, vent arrangements, etc., can solve the problems of reducing the lifespan affecting the production efficiency of the die assembly, so as to reduce the amount of processing applied to the metal sheet by a reduce the working load on the single annular projecting portion, and suppress the occurrence of work hardening

Active Publication Date: 2016-11-29
NISSHIN STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method and apparatus for manufacturing a battery safety valve, which can precisely mold a thin annular portion with reduced processing load and increased lifespan of the die assembly. This is achieved by simultaneously pressing the annular projecting portions provided on the punch and the die against the metal sheet, resulting in reduced processing load and suppression of cracks and work hardening. Additionally, the working load can be dispersed between the punch and the die, providing further improvement in the lifespan of the die assembly.

Problems solved by technology

Stainless steel, on the other hand, is a hard material having great strength, and therefore, when an attempt is made to process the thin annular portion of the safety valve using the conventional method, cracks are more likely to appear during the processing.
Further, the thin portion cannot be processed precisely due to work hardening.
Furthermore, with the conventional method, the load generated during formation of the thin annular portion is concentrated on the annular projecting portion of the engraving punch, leading to a reduction in the lifespan of the die assembly.

Method used

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  • Method and apparatus for manufacturing a battery safety valve, a battery safety valve, and method for manufacturing a battery case lid
  • Method and apparatus for manufacturing a battery safety valve, a battery safety valve, and method for manufacturing a battery case lid
  • Method and apparatus for manufacturing a battery safety valve, a battery safety valve, and method for manufacturing a battery case lid

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Experimental program
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Effect test

first embodiment

[0027]FIG. 1 is a perspective view showing a safety valve 2 of a secondary battery according to a first embodiment of the present invention. In the drawing, a lid 1 is constituted by a stainless steel metal sheet, and constitutes a battery case of the secondary battery. The lid 1 is provided with the safety valve 2 for a secondary battery, which ruptures when an internal pressure of the battery case exceeds a predetermined value so as to release the internal pressure to the outside. The safety valve 2 is provided with a thin annular portion 3 and a bent portion 4.

[0028]The thin annular portion 3 is an elliptical groove constituting an edge portion of the safety valve 2, and is formed to be thinner than the remaining sheet surface of the lid 1. The thin annular portion 3 splits first when the internal pressure of the battery case exceeds a predetermined value, thereby causing the entire safety valve 2 to rupture. Note that an outer shape of the thin annular portion 3 may take any for...

second embodiment

[0053]FIG. 5 is a perspective view showing a lid 1 of a battery case according to a second embodiment of the present invention. In the drawing, the lid 1 constituting the battery case of a secondary battery is provided with a safety valve 2 for a secondary battery, which ruptures when an internal pressure of the battery case exceeds a predetermined value so as to release the internal pressure to the outside. The safety valve 2 is provided with a thin annular portion 3 and a bent portion 4.

[0054]The thin annular portion 3 is an elliptical groove constituting an edge portion of the safety valve 2, and is formed to be thinner than the remaining sheet surface of the lid 1. The thin annular portion 3 splits first when the internal pressure of the battery case exceeds a predetermined value, thereby causing the entire safety valve 2 to rupture. Note that an outer shape of the thin annular portion 3 may take any form having an enclosed outer edge, for example a circular form, a polygonal fo...

third embodiment

[0087]FIG. 10 is an illustrative view showing a method for manufacturing a battery case lid according to a third embodiment of the present invention. In the second embodiment, tensile stress acting on the thin annular portion 3 during the drawing process is reduced by implementing the drawing process on the metal sheet 100 in a condition where the outer peripheral side sheet surface 10 on the periphery of the thin annular portion 3 is restrained by the restraining means 54. It is however difficult to eliminate the action of the tensile stress on the thin annular portion 3 completely, and therefore the thickness of the thin annular portion 3 may be reduced by tensile stress. When the thickness of the thin annular portion 3 decreases below a predetermined thickness, the thin annular portion 3 ruptures before the internal pressure of the battery case reaches a pre-envisaged pressure.

[0088]Hence, whereas in the second embodiment the thickness of the thin annular portion 3 is reduced to ...

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Abstract

In a method for manufacturing a battery safety valve according to the present invention, a stainless steel metal sheet is used, and an thin annular portion constituting an edge portion of a safety valve is formed in a lid by simultaneously pressing annular projecting portions provided respectively on a punch and a die so as to oppose each other, against respective surfaces of the lid.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a U.S. national phase application filed under 35 U.S.C. §371 of International Application PCT / JP2012 / 056419, filed on Mar. 13, 2012, designating the United States, which claims priority from Japanese Patent Application No. 2011-077913, filed Mar. 31, 2011, which are hereby incorporated herein by reference in their entirety.TECHNICAL FIELD[0002]The present invention relates to a method for manufacturing a battery safety valve, an apparatus for manufacturing a battery safety valve, a battery safety valve, and a method for manufacturing a battery case lid, and more particularly to a novel improvement in which a stainless steel metal sheet is used and a thin annular portion constituting an edge portion of a safety valve is formed on the metal sheet by simultaneously pressing annular projecting portions provided on a punch and a die so as to oppose each other against respective surfaces of the metal sheet, with the result t...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01M2/12B21D51/38
CPCH01M2/12B21D51/383H01M2/1241H01M50/3425Y02E60/10Y02P70/50H01M50/147H01M50/30
Inventor OOTSUKA, MASATOMORIKAWA, SHIGERU
Owner NISSHIN STEEL CO LTD
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